改进的堆石坝变形计算参数敏感性分析方法  

Improved sensitivity analysis method for calculating the deformation parameters of the rock-fill dam

作　　者：陈辉[1] 刘东海[1] 戚蓝[1] CHEN Hui LIU Donghai OI Lan(State Key Laboratory of Hydraulic Engineering Simulation and Safety, Tianjin University, Tianjin 300072, Chin)

机构地区：[1]天津大学水利工程仿真与安全国家重点实验室,天津300072

出　　处：《河海大学学报（自然科学版）》2017年第5期406-412,共7页Journal of Hohai University(Natural Sciences)

基　　金：国家自然科学基金面上项目(51479132;51679164);国家自然科学基金创新群体研究项目(51321065)

摘　　要：为提高邓肯-张E-B模型计算堆石坝变形的精度,提出基于全域有限元计算节点的单因素分析方法和基于双判别方式的正交试验方法,分析大坝变形对坝料密度和模型参数的敏感性,确定大坝变形计算的主要影响参数。实例分析表明,φ_0、K_b、ρ、R_f、K等对大坝变形的影响显著,故需重点研究这5个参数在空间上的差异性。该研究方法解决了传统单因素分析方法样本缺乏代表性的弊端,可以定量给出参数敏感性的显著性水平,提高了敏感性分析的全面性和准确性,可为堆石坝变形精细分析时合理选择需进行空间赋值的模型参数提供依据。To improve the calculation accuracy of the Duncan-Chang E-B model regarding the deformation of the rock-fill dam, the single factor analysis method based on finite element calculation nodes in the whole zone of the computational dam is proposed together with the orthogonal experimental method based on the double discriminant method in this study. The sensitivity of dam deformation due to the compacted density of dam and the model parameters is studied, so as to ascertain the main influencing parameters of the dam deformation. A case study indicates that the dam deformation is significantly influenced by five parameters i. e. ~0 ,Kb ,P,Rr and K, and their spatial differences deserve further research with emphasis. The methods proposed in this paper overcome the disadvantages of traditional single factor method, in which the samples are lack of representatives. With these methods, the significance level of parameters sensitivity can be determined in a quantitative way, thus improving the comprehensiveness and precision of the sensitivity analysis and providing some reference for the reasonable selection of model parameters that require spatial assignment in the refined analysis of rock-fill dam deformation.

关 键 词：堆石坝 大坝变形 邓肯-张模型 模型参数 敏感性分析 正交试验法 

分 类 号：TV641.4[水利工程—水利水电工程]